Is a font that is easy to read even for people with dyslexia who have difficulty reading and writing really effective?

The effect of a specialized dyslexia font, OpenDyslexic, on reading rate and accuracy | Annals of Dyslexia
https://link.springer.com/article/10.1007/s11881-016-0127-1
Do Dyslexia Fonts Actually Work? | Edutopia
https://www.edutopia.org/article/do-dyslexia-fonts-actually-work/
The research focused on a font called ' OpenDyslexic ,' designed for people with dyslexia. OpenDyslexic features letters that appear to have 'weight' at the bottom, which makes it easier for people with dyslexia to recognize the direction of the letters, making them easier to read.

When various fonts and OpenDyslexic are lined up, it looks like this. It seems that the legibility of similar characters such as 'd', 'p', 'q', and 'b' has improved.

However, a study published in 2017 denied the effectiveness of OpenDyslexic. The research team conducted a reading speed test on 12 elementary school students, including both dyslexic and non-dyslexic children, using Arial, OpenDyslexic, and Times New Roman. No significant difference was found among the three fonts.

In Japan, the results of an experiment to see if UD digital textbook fonts would help children with dyslexia were published in 2023. This experiment also showed no correlation between fonts and cognitive ability.
Will universally designed digital textbooks designed for children with visual and reading disabilities improve reading aloud and comprehension? - GIGAZINE

OpenDyslexic is a font created from the idea that 'dyslexia is caused by visual factors.' However, previous research on dyslexia has revealed that 'dyslexia is not caused by visual factors.' In addition, the International Dyslexia Association strongly denies the effectiveness of colored glasses and exercises that are advertised as 'helpful in alleviating dyslexia.'
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